https://virtuallyfun.com/2009/08/23/tip-on-memory-for-windows-nt-3-1-users/ Fun with Virtualization Sun, 26 Apr 2015 16:58:02 +0000 hourly 1 https://wordpress.org/?v=7.0 https://virtuallyfun.com/2009/08/23/tip-on-memory-for-windows-nt-3-1-users/comment-page-1/#comment-133506 Sun, 26 Apr 2015 16:58:02 +0000 https://virtuallyfun.com/?p=155#comment-133506 I mean INT 15/AX=E801h and INT 15/AX=E820h of course. NT 3.1 already supports the E801h one (with a minimum requirement of 12MB of RAM it was obvious that 88h was not going to be enough!), and NT 3.5 added support for the E820h one.

]]> https://virtuallyfun.com/2009/08/23/tip-on-memory-for-windows-nt-3-1-users/comment-page-1/#comment-940 Sat, 13 Aug 2011 21:01:30 +0000 https://virtuallyfun.com/?p=155#comment-940 The problem was the BIOS memory probing calls that existed at the time. In particular, INT 15h/AH=88h could not report more than 64MB of RAM (some BIOSes in fact only reported up to 16MB of RAM). Later there was INT 15/AH=E801h and the INT 15/AH=E820h calls to solve this problem, but there were OSes that used E801h only if 16MB of RAM was reported via 88h.

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